package com.ruoyi.web.controller.durian.websocket;

import com.ruoyi.durian.service.LlDriverService;
import com.ruoyi.framework.websocket.SemaphoreUtils;
import com.ruoyi.framework.websocket.WebSocketUsers;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.util.concurrent.Semaphore;

/**
 * websocket 消息处理
 *
 * @author ruoyi
 */
@Component
@ServerEndpoint("/websocket/taxi/{userId}/{startAddressId}/{endAddressId}/{startTime}/{friendId}/{orderType}")
public class TaxiSocketServer {
    /**
     * WebSocketServer 日志控制器
     */
    private static final Logger LOGGER = LoggerFactory.getLogger(TaxiSocketServer.class);

    /**
     * 默认最多允许同时在线人数100
     */
    public static int socketMaxOnlineCount = 100;

    private static Semaphore socketSemaphore = new Semaphore(socketMaxOnlineCount);

    // 这里使用静态，让 service 属于类
    private static LlDriverService llDriverService;

    // 注入的时候，给类的 service 注入
    @Resource
    public void setDeviceListenerService(LlDriverService llDriverService) {
        TaxiSocketServer.llDriverService = llDriverService;
    }

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session,
                       @PathParam("userId") Integer userId,
                       @PathParam("startAddressId") Integer startAddressId,
                       @PathParam("endAddressId") Integer endAddressId,
                       @PathParam("startTime") String startTime,
                       @PathParam("friendId") Integer friendId,
                       @PathParam("orderType") Integer orderType) throws Exception {
        boolean semaphoreFlag = false;
        // 尝试获取信号量
        semaphoreFlag = SemaphoreUtils.tryAcquire(socketSemaphore);
        if (!semaphoreFlag) {
            // 未获取到信号量
            LOGGER.error("\n 当前在线人数超过限制数- {}", socketMaxOnlineCount);
            WebSocketUsers.sendMessageToUserByText(session, "当前在线人数超过限制数：" + socketMaxOnlineCount);
            session.close();
        } else {
            // 添加用户
            WebSocketUsers.put(userId.toString(), session);
            LOGGER.info("\n 建立连接 - {}", session);
            LOGGER.info("\n 当前人数 - {}", WebSocketUsers.getUsers().size());
            WebSocketUsers.sendMessageToUserByText(session, "连接成功");
            // 生成前等待订单
            llDriverService.saveOrder(startAddressId, endAddressId, orderType, startTime, friendId);
        }
    }

    /**
     * 连接关闭时处理
     */
    @OnClose
    public void onClose(Session session) {
        LOGGER.info("\n 关闭连接 - {}", session);
        // 移除用户
        boolean removeFlag = WebSocketUsers.remove(session.getId());
        if (!removeFlag) {
            // 获取到信号量则需释放
            SemaphoreUtils.release(socketSemaphore);
        }
    }

    /**
     * 抛出异常时处理
     */
    @OnError
    public void onError(Session session, Throwable exception) throws Exception {
        if (session.isOpen()) {
            // 关闭连接
            session.close();
        }
        String sessionId = session.getId();
        LOGGER.info("\n 连接异常 - {}", sessionId);
        LOGGER.info("\n 异常信息 - {}", exception);
        // 移出用户
        WebSocketUsers.remove(sessionId);
        // 获取到信号量则需释放
        SemaphoreUtils.release(socketSemaphore);
    }

    /**
     * 服务器接收到客户端消息时调用的方法
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        // 初始化订单
        llDriverService.createBeforeOrder(message);
    }

}
